<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        body {
            margin: 0;
        }
        #wrap {
            margin: 20vh auto;
            width: 260px;
            height: 50vh;
            border: 1px solid #000;
            overflow: hidden;
        }
        #list {
            margin: 0;
            padding: 10px 5px;
            list-style: none;
            font: 16px/2 "宋体";
        }
        #list li {
            border-bottom: 1px solid #000;
        }
    </style>
</head>
<body>
<div id="wrap">
    <ul id="list"></ul>
</div>  
<script>
{
    let list = document.querySelector("#list");
    list.innerHTML = [...(".".repeat(100))].map((item,index)=>`<li>这是第${index}个li</li>`).join("");
    for(let i = 0; i < list.children.length; i++){
        list.children[i].addEventListener("touchend",()=>{
            console.log(i);
        })
    }
}    
</script>  
<script>
{
    let list = document.querySelector("#list");
    let startPoint = 0;//按下时鼠标的位置
    let startEl = 0;//按下时元素的位置
    let y = 0;
    list.addEventListener("touchstart",(e)=>{
        let touch = e.changedTouches[0];
        startPoint = touch.clientY;
        startEl = y;
    });
    list.addEventListener("touchmove",(e)=>{
        let touch = e.changedTouches[0];
        let nowPoint = touch.clientY;
        y = startEl + (nowPoint - startPoint);
        list.style.transform = `translate3d(0,${y}px,0)`;
    });
}
</script>
</body>
</html>